Tappet-noise eliminator



Nov. 20, 1928.

A. CLEMENSEN TAPPET NOISE ELmINA'ron Filed Jan. 22, 1927 ,eliminating or reducing the noise or Patented Nov. '20,A

UNITED STATES PATENT' oFFicE.

f AXEL CLEMENSE'N, or cmcneo, ILLINOIS.

TAPPET-N-'QISE ELIMHTATQR.'

v Application led January 22, 1927. Serial No. 162,709.

i This invention relates to an internal combustion engine and more particularly to an improved mechanism associated with gine valve mechanism for the purpose .of inarily produced by loose tappets.

Itis an object of this invention to provide a tappet noise eliminator for use in connection with internal combustion engineshsaid noise eliminator mechanism being-associated with the valve stem and mainly comprising .concentric sleeves constructed of different metals and having different coefficients of expansion whereby the tappet adjustment screw is adapted to be set to contact the lower end of one of said sleeves to eliminate clearance, thereby reducing tappet noise to a minimum.

It isan important object of this invention I to provide an internal combustion engine valve or tappet mechanism with expansible metal sleeves having dierent coeilicients of 'cal section view of an internal combustion engineillustrating a valve and tappet mechanism embodying the princi les of this invention with arts shown in e evation an'd with the operation illustated in dotted lines.

Figure 2 i's a transverse detail section taken vmi iin@ ii-ii ofrigure 1.

Figure 3 illustrates a vertical section 'through a tappet mechanism embodying the principles of this invention and having associated therewith a standard valve mechanism,

a fragmentary portion of which is illustrated.

As shown on the drawings:

The reference numeral 1v indicates a cylinder of an internal combustion engine casting which has integrally formed thereon a valve cage 2 and a water jacket 3 above a horizontal partit-ion or bracket 4 which forms a part of thecasting or the top wall of the crank case 5.

The bracket 4 is provided with a passage in which a', valve.tappet 6 is slidably mounted with the tappet head 7 engaged bya cam 8 mounted on the engine cam shaft 9. The tap -pet is provided with 4an adjustment nut orscrew 10 adapted to be held in an adjusted' position by means of a lock nut 11. j

Coacting with a valve seat 12 formed in the valve cage 2 is a valve head 13 having a valve stem 14 which projects downwardly and terminates in a ange or disk 15. The ,valve stem let projects axially through an inner valve sleeve 16 constructed of a metal having a high coeiicient of expansion.. The lower nd of the inner sleeve- 16 is held seated.

against the' valvedisk 15 by means of an axially passaged retaining cap 17 through which the valve stem'14 also projects. The

`reduced threaded portion of the cap 17 is threaded in the upper threaded endV of an outer valve sleeve 18 constructed of a diiierent kind of metal from the sleeve 16 and having a low coeiicient of expansion. The lower -en'd'of the outer valve'sleeve 18 is closed and is adapted to be contacted by the tappet adjustmentscrew 10, thereby eliminating tappet clearance. The closed end of the outer valve sleeve 18 affords a pocket below the valve disk .15.'said pocket having positioned therein a plurality of arced friction plate springs 19 which normally act to hold thevalve disk 15 'resiliently against the lower en'd of the inner sleeve 16. The outer valve sleeve 18 projects through a valve stem. guide 2() which is integrally formed on the casting 1 below the valve cage 2. Engaged around the valve. stem guide 20 is the upper" end of a coiled valve spring21 which is coiled around the outer valve sleeve 18 and has thelower end thereof seated in a groove provide-d in the upper face of a stop plate or disk 22 which is slidably engaged around the lower portion of the outer sleeve 18 and resiliently seats against a stop ring 23 engaged Within 'a peripheral groove formed in the lower rtion of the outer sleeve I 18. The coiled spring 21 'thus acts to resiliently hold the valve sleeves in their llowermost position with the valve head 13 seated in the valve seat 12.

To eliminate clearance between the lower closed end of the outer valve sleeve 18 and thetappet-mechanism, the tappet lock nut 11 is loosened and tfippet adjustment screw 10 is set to contact the lower end of the outer sleeve 18.

The locknut is thenturned into a-locking positionto holdlthextappet adjusted.

:The-.tappet noise-is reduced due to the peculiar arrangement of the two concentric valve sleeves 16 and 18zwhich are constructed of 'diiferent kindsof metal with the inner sleeve 16 being constructedof a metal having a high coeiicientof expansion, so that when the sleeves 16 and 18.become heated the-inner sleeve 16 will expand an amount greater thanv the amount ofl expansion of the outer sleeve 18.'- I By heating the valve and tappet mechanisms the fvalve stem .14, which is constructed of the same metal as the outer sleeve 18, eX- pands: downwardly from the 'valve seat 12` thereby causing` the friction plate springs 19 to be compressed an 'amount sufficient to allow for the .expansion of the valve stein. The amount of expansion of the inner sleeve 16 is greater than the expansion of the valve stem 14 and the outer sleeve 18, permitting Vthe inner sleeve not only to expand downwardly to compensate for the downward expansion of the valve ste'm 14, but is also permitted to expand upwardly with the outer sleeve- 18 an internal combustion engine instead of with the valve mechanism. In this form of the device the reference numeral 24 indicates a standard valve stem provided with a coiled control spring 25. The lower end of the valve stem is'in Contact with the head of avalve tappet adjusting screw 26 provided with a check nut 27. Thendjusting screw 26 is.

threaded into the upper end of an inner tappet sleeve 28 the upper end of which is provided with a flange 29 against which' the check nut is adapted to seat. inner-tappet sleeve 28 is closed by means of a flanged head 29 which is slidably engaged in an outer tappet sleeve 30 constructed of a metal having a low coefficient of expansion.

The lower end of the outer tappet sleeve 30 is closed by means of a tappet head 31 with which a lifter cam 32 is positioned to coaet. The outer tappet sleeve 30 is slidably mounted in a tappet guide bracket`33 forming a part of the casting of an internal combustion engine. Seated in the lower closed end of the outer tappet sleeve 30 are a plurality of arched friction platesprings 34superiinp'osed on one another, with the uppermost spring in contact with the middle portion of the head 29 of the inner tappet sleeve. `Engaged metal having a .upper portion of outer tappet sleeve A30:

The lower end ofthe around the inner tappet sleeve 28 is an intermediate tappet sleeve 35 constructed of a high coeiiicient of expansion. The lower end inner tappet sleeve 28. Engaged around the the inner tappet sleeve 28 below the ange 29 is anaxially passaged retaining cap or collar-36 having a reduced exteriorly threaded portion which is threaded l into the'. upper interiorly threaded end 'of the The inner Aend of the retaining/cap l36 is. in contact-with the upper end of the intermediate tappet. sleeve 35.

.In the form of the-- device illustrated in Figure 3 the tappet-noise is adapted to be reduced dueto theipeculiarzarrangement of the concentric vtappet sleeves30and 35 which are constructed of different kinds of metal, with the sleeve 35 being constructedof ametal having a high Ecoefficient of@ ,expansionu so, that when the sleevesdand. 35beco1ne heated the inner sleeve'35 will-expandan amount greater vthan the amountfbfg expansion of the outer tappet sleeve: 30. iThe. inner .tappet sleeve 28 is constructed of ithegsame metal as the outer tappet sleeve 30vso1that -when the valve and tappet mechanisms become. heated the inner tappet sleeve 28 expands downwardly, thereby causing the friction plate springs 34 te be compressed an amount suflicient to allowv for -the expansion of said 'inner tappet sleeve.

.Inasmuch as theamount of expansion of the intermediate tappet sleeve 35 is greater than the expansion of the inner tappet sleeve 28 and the outer tappet sleeve 30 the intermediate tappet sleeve 35 is permitted not only to expand downwardly tocompensate for the downward expansion of the inner valve sleeve 28, but is also permitted to expand upwardly,

with-.the outer sleeve 30 adording an arrangement whereby the vupper end of the outer tappet sleeve 30 is maintained in the same position to maintain the various tappet and valve parts in their proper working relation without any tappet clearance, thereby roducing a substantially noiseless engine as ar as tappet noise is concerned. i'

I am aware that many changes may be made, and' numerous details of construction may be varied through a wide range without departing from the principles of this invention, and I therefore do not purpose limiting the patent granted hereon, otherwise than necessitated by the prior art.

I claim as my invention:

of the intermediate tappet sleeve 35 rests upon the flanged head 29 of the lim , 1. The combination with an .internal coni- A bustion engine' and a tappet -niechanism thereof, of a valve, a valve stem formed thereon, a disk formed on the lower end of said valve stem, an inner sleeve surrounding the valve stem and resting on said disk, an outer sleeve surrounding said inner sleeve with the lower end of said outer sleeve closed and in Contact -with said tappet mechanism,

a plurality of superimposedv friction plate springs in the lower end of said outer sleeve below said valve stem disk, a stop ring recessed into the outer periphery of said outer sleeve, a stopplate engaged on said outer sleeve above said sto ring, and a coiled spring engaged aroun said 'outer sleeve and seated against said stop plate.

2. The combination With an engine valve cage having a valve seat formed therein, of a valve head adapted to seat on said valve seat, a guide integrallyormed on said valve cage, a stem on said valve head, a disk formed on the lower end of said valve stem, an adjustable tappet mechanism, an inner sleeve surrounding said valve stem and seated on said disk, said inner sleeve having a high coeticient of expansion, an 'outer sleeve surrounding said inner sleeve and having a low coethcient of expansion, said outer sleeve bc- ,ing closed ai its lower end and in contact with the tappet mechanism to eliminate clearance, plate springs insaid outer sleeve below the valve stem disk, a -cap surrounding said valve vstem and engaged in 'the upper end of-said outer sleeve to contact the upper end of said innersleeve, stop members mounted on the lower end of said outer sleeve, and a valve control spring engaged around said outer sleeve with the lower end of said spring engaging said stop members and the upper end of said spring engaged around said guide.

3. The combination with an engine casting, of a ,tappet mechanism mounted thereon, a valve, a valve stem formed thereon, a disk on the lower end of said valve stem, an inner sleeve surrounding the valve stem and contacting saidv disk, an outer sleeve surrounding said inner sleeve with the outer sleeve closed at its lower end and contacting said tappet mechanism, spring -members positioncd in the outer sleeve below the valve stem disk, a cap engaged in the upper end of said outer sleeve and contacting said inner' sleeve, and a spring mounted on said outer sleeve for normally holding thev valve in `closed position.

4. The combination with an engine casting and a valve seat formed therein, of a valve adapted to seat in said valve seat., a stern on said valve, a pluralityT of concentric sleeves on said valve stem with said sleeves constructed of different kinds of.metal having 'different coefficients of expansion, spring members in said outer sleeve below the valve stern, means connecting the upper ends of said concentric u, sleeves, a tappet mechanism, adjustable said stop members.

1 5. The combination with an adjustable enmeans forming a part thereof adapted to be set in contact with the outer one of 'said sleeves to eliminate clearance, stop members on said outer sleeve, and a spring engaged around said outer sleeve and seated against gine tappet mechanism, of a valve, a .valve -seat therefor, a stem formed on said valve,

a disk on the lower end of said valve stem, an'

inner sleeve surrounding said valve stem constructed of a metal having a lugh coelicient of expansion, an outer sleeve surround- 6. The combination with an'engine tappet' mechanism and a valve mechanism, of a plurality of concentric sleeves constructed of different-.kinds of Ametal having different coetlicients of expansion, saidslceves being carried by the valve mechanism, spring members between said sleeves and said valve mechanism.,

and a control spring for `the valve mechanism engaged around said concentric sleeves.

7. The combination with a valve seat'and valve, of an adjustable tappet mechanism, a plurality of concentric sleeves carried by the valve with one of said sleeves being in contact with the tappet mechanism :and having a c0- eicient of expansion less than the coetHcient of expansion of the other sleeve, spring members between said valve mechanism and said sleeves, and a control spring engaged around said sleeves for normally holding the valve on said valve seat.

8. A tappet noise eliminator mechanism comprising an engine tappet, a valve cage having a valve seat formed therein, a valve mechanism for coaction with said valve seat, a plurality of concentric sleeves carried by the valve mechanism with said sleeves constructed of dierent kinds of metal having different coetlicients of expansion, springs positioned between said sleeves and said valve mechanism, and a control spring surrounding said sleeves for normallyholding the valve engaged in said valve seat.

9. The combination with an engine tappet mechanism of a valve mechanism, a plurality ofconcentric sleeves carried by said .valve mechanism with said sleeves constructed of dilerent kinds of metal having different coetlicients of expansion, said tappet mechanism being normally set to eliminate clearance between the tappet mechanism and said concentric sleeve, and resilient means carried by said concentric sleeves to assist .the same in contacting'said tappet mechanism.-

10. The combination with a tappet mechanism, of 'a valve mechanism, and expansible members havin different coefficients of expansion carrie '.Qngthe valve mechanism adapted to permit .to be mounted without clearance to obviate tappet members and spring means lermitting the noise.. tappetvmechansm and said .va

11. The combination with a tappet mecha-` to' be mounted in contacting relatiolrto .oby nism, of a valve mechanism, expansibie memviate clearance and tappeti noise. .j 5 -bers associated with one of said mechanisms In testimony whereof I have hereunto subwith' said members having different coeiscribed my name atChicagoyCook County, cients of expansion, and spring means carried Illinois.- i f, l by sid expansible members,- said expansible AXEL CLElMlEIlSIEIT.

ve mechanism ll- 

